Invention Grant
- Patent Title: Process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive useful products
- Patent Title (中): 高沸点空气和/或温度敏感有用产品混合物的精馏方法
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Application No.: US12911200Application Date: 2010-10-25
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Publication No.: US08420838B2Publication Date: 2013-04-16
- Inventor: Juan Herguijuela , Werner Pietzonka , Angela Wildermann , Thomas Wolf
- Applicant: Juan Herguijuela , Werner Pietzonka , Angela Wildermann , Thomas Wolf
- Applicant Address: NL Heerlen
- Assignee: DSM IP Assets B.V.
- Current Assignee: DSM IP Assets B.V.
- Current Assignee Address: NL Heerlen
- Agency: Nixon & Vanderhye P.C.
- Priority: CH1365/04 20040819
- Main IPC: C07D311/00
- IPC: C07D311/00 ; B01D3/14

Abstract:
According to the invention, a process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process is characterized in particular in that, in a first purification stage, low-boiling products and unspecified isomers of the useful product are separated from the product stream virtually without loss of useful product and that, in a second purification stage, the useful product is removed in a stream having a purity of >97% by weight and a further stream having a purity of >92% by weight. A preferred embodiment of the process serves for working up VEA, in which the loss of useful product in the first purification stage is less than 5%, based on that amount of VEA in the feed which is added to the purification stage per unit time. Furthermore, the first purification stage may comprise a rectification column (1), from the top (1a) of which the low-boiling products and the unspecified isomers of VEA are taken off, a stream containing the useful product in purified form being taken off at the side (15) and/or at the bottom (1b) of the column (1).
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